Sheet material



FIG. 1 is a front, right perspective view of the sheet material showing my new design;

FIG. 2 is a top plan view thereof, the bottom plan view being an identical image thereof;

FIG. 3 is a left side view thereof, the right side view being an identical image thereof; and,

FIG. 4 is a front view thereof, the rear view being an identical image thereof. 

CLAIM The ornamental design for a sheet material, as shown and described. 